Abstract
The attachment rate of atoms and ions to the atmospheric aerosol indoors and outdoors was studied by means of the Tn( 220Rn) decay products, which have a diffusion coefficient D = 0.068 cm 2 s −1 and a sticking probability S = 1. In a nuclei concentration range between 0.6–7 × 10 4 particles cm −3 the attachment rates were 0.009–0.05 s −1 (relative humidity : 30–50%) corresponding to a half-life of attachment 77 to 14 seconds. The change of the average nuclei size with humidity could be determined by measuring the attachment rate for different water vapour concentrations. By changing the humidity from 20% to about 100%, the average particle size increases up to a factor of 2.1.
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